Disobeying orders, ASTRA Corporation pilot and explorer Selene Vassos attempts to land on the off-limits planet of Atropos to investigate what she dubs the "White Shadow" signal, which somehow seems familiar to her. Upon arrival, Selene's ship, Helios, suffers heavy damage and crash lands. Unable to contact ASTRA, Selene explores the planet and is shocked when she comes across corpses of herself. She learns that every time she dies, time loops back to the moment she crashed, sending her back to her starting point. The planet seems to change with every loop, and Selene begins experiencing vivid visions.
The game is split into two halves, each consisting of three biomes. If the player dies during a run, they are sent to the beginning of the half. Selene has the ability to dash and can later unlock a grappling hook that lets her shoot to predefined points in a room. The xenomorph enemies launch arcade-like geometric arrangements and colors of energy, lines, fireballs in expanding spiral, square and spherical arrays, hoops, lasers which require strategy to navigate. Players can find a variety of weapons in the game, ranging from a basic pistol to an Electropylon Driver. Each weapon has unique traits that can be leveled up to unlock enhanced perks that can deal more damage. Selene additionally has a melee weapon that can be used to attack enemies, destroy resource geodes, or destroy barriers.